Current ATM DVR can be divided into three basic types: one is the direct use PC industrial computer; The second is to use the PC motherboard compression boards; Third, embedded all-in-one. The first two are using commercial PC motherboard, the operating system generally adopts the commercial version of WINDOWS, LINUX, latter USES specially designed motherboard, and motherboard, compression plate, chassis integration, using commercial real-time operating system, or an open real-time operating system. Comparison, embedded digital hard disk video recorder completely from the PC platform, monitoring, video size can according to need to be flexible customization, using high-performance real-time operating system, respond to abnormal events, has a unique advantage in the ATM DVR.
Therefore, more outstanding, make full use of their strong technical development strength, overcome the difficulties of early need large capital investment, introduced a more mature embedded ATM DVR. For example hikvision new DS - 8002 ah, designs in the light of ATM monitoring is an excellent embedded ATM DVR.
ATM DVR requires 3 way video input, were monitoring the main screen (face), and internal personnel outfit chao chao outlet picture. Like normal DVR, ATM DVR is all-sided, request the full video, image playback, flexible linkage alarm, powerful network; Compared with ordinary DVR, due to the application environment, monitoring objects, such as external interface, ATM DVR has many features, at the same time, we need the corresponding special technology to realize the special function.
Small size low power consumption
Due to the ATM machine is mostly exposed to outdoor, and it is unattended, so for ATM machine design is a riot and do not carry, also require ATM DVR has these characteristics. At present there are two kinds of general practice: one is put on the outside of the ATM machine, used to reinforce the case alone, another kind is put ATM DVR directly inside the ATM machine. ATM DVR need to reinforce the case because the first one, and must be tied to an ATM machine together, to the difficulty of the DVR installation work has increased a lot, and it is difficult to guarantee safety. So we suggest to take the second method. But when a lot of ATM machine design DVR to set aside lots of space, DVR had to thin body, takes an ATM machine in the small space. ATM machine generally adopts the seal structure, the inside of the machine at work is not very good heat, cause ATM DVR environmental temperature is very high, thus giving the ATM DVR in bad work stably for a long time under the external environment of higher requirements are put forward.
In order to solve this problem, the selection of components, need to choose stable and high working temperature, low power consumption, and at the same time should be within the thermal cycle of design, reduce on the inside of the ATM DVR heat coming from the large capacity hard drive to work. In addition some manufacturer good used hard disk dormancy technology, is when there is no video, hard disk can be placed in a suspended state, minimize the power consumption of hard disk, while reducing the heat coming from the hard disk.
Save the video footage for a long time
Due to the ATM request 24 hours to provide services, and unattended, so requires 24 hour ATM DVR to stable work, at the same time, Banks generally require video saved one to three months, or even half a year. To achieve this function, may consider increasing the hard drive capacity, increase a single hard disk capacity increased capital investment, increase the quantity of the hard drive is not only limited to the volume of ATM DVR, need to increase investment, at the same time also increased the ATM DVR power consumption, affect the stability of the ATM DVR.
More practical effective method at present, is to reduce the effective video data storage space. On the premise of meet the requirements of image resolution, increase the compression ratio of the image, we can reduce the capacity of the video data. This requires that choose a good compression algorithm, like many manufacturers choose h. 264 standard compression algorithm, about 30% higher than that of traditional mpeg-4 compression ratio. On the premise of guarantee effective video footage, reduce useless video data, can also reduce the capacity of the video data. Currently used method is to use an alarm triggers video or motion detecting video trigger. Using mobile test trigger decreased the input for the infrared alarm, etc, but under the influence of environment is larger, and prone to error or omission. In order to later to see the whole operation process, various video need to configure the flexible pre - recorded video and latency, such a person close to the process and leave process can be recorded, pre - recorded video time and delay time can be set according to user's need.
Accurate motion detecting and video signal loss detection
Due to the concealment of the ATM monitoring requirements, ATM monitoring and control system in the main port and a pinhole camera, commonly used money mouth, and in order to facilitate people to use the ATM machine is generally installed in the moving object is more place, day and night change of light intensity, and so on are prone to motion detecting misstatement, omission phenomenon. On the premise of improve the quality of the pinhole camera, ATM DVR itself how to provide a good detection mechanism? If the simple lower sensitivity, will result in omission; If we can only improve the sensitivity, can lead to false positives.
Some manufacturer use noise reduction processing, here is our of the acquisition to the original signal through algorithm processing, to reduce the interference factors of the environment, and then tested for mobile, is more accurate. In addition some manufacturer are exploring to make ATM DVR realize adaptive external environment adjust the sensitivity of the function, can be better to reduce false positives and omission. When not connected to a road camera, or video line damage causes such as video signal loss, video can be detected in the first and in a timely manner, according to a preset method to deal with the local alarm or uploaded to the alarm monitoring center through the network, for the center for analysis and further processing.
Partial shade technology
Due to protect the needs of the user's password, ATM DVR for video images of absolute can't see the password keyboard and the user's password information. To achieve this function, when install cameras to avoid the password keyboard, some do block processing during playback, we think the better way is before the image compression to remove this part of the need to keep out of the frame, as long as the area of the flexible Settings need to keep out, can be in the front to remove the password keyboard part of the image, whether local preview, or video replay will not leak user's confidential information, and have never recoverability, completely eliminate the possibility of an inside job.
Two-way synchronous playback and video clips backup
Because a few road the correlation of video data, double road playback is required for local playback. Dual playback time according to the mouth of the Lord or video files, or into chao chao outlet channel mouth, picture appears on the screen at the same time, the double playback and single road playback through flexible panel key switch. How to guarantee the frame synchronization of dual playback? Common practice is to ensure that the beginning of time synchronization, play in the process of the two images are independent, as long as the two road playback speed, or a video data time jump all the way, would be a two-way playback sync phenomenon; Better way is to check real-time compression stream of absolute time scale (record the time when the encoding), there are only play time scale small jump when it all the way, absolute guarantee that the time to play on, so as to achieve the complete synchronization in the playback process.
Local playback multiple time period can be selected at the same time, the backup to a specified device. Now more use U disk backup device, large capacity IDE/USB hard drives, DE/USB recorders, and 1394 interface equipment, etc. To provide users with a convenient way of splicing, a variety of flexible high-speed backup interface will greatly improve user satisfaction.
Card stacking and blacklist confirm function
This feature is ATM DVR a prominent function. Directly added in the picture on the corresponding card number, transaction type, and transaction information, plus the characters on the video image information, more convenient help identify trace afterwards, at the same time to deal with disputes with the user to provide greater credibility. Through the RS - 232 serial port to receive an ATM card number information, or by capture network packets, analytical data card card number information. Has the function of network, card number information can be transmitted to the monitoring center, monitoring center to find the database, if the card number appeared in the blacklist, center can according to the nature of the event, compulsory swallowing card, linkage 110, start the entrance guard.
Accurate alarm detection and powerful alarm linkage function
ATM DVR generally has four alarm input interface, two alarm output interface, the interface way more use switch quantity. The sensitivity of detection alarm input requirements is relatively high. Banging on the ATM machine, for example, the duration of the vibration alarm may be only a few tens of milliseconds, if not enough sensitivity, is likely to produce false positives. ATM DVR support powerful alarm linkage in total, when a video is missing, partial occlusions, alarm, accurate to respond in a timely manner. Alarm events can trigger signal output, local trigger dialer, can also be transmitted to the monitoring center through the network, the monitoring center to make corresponding processing, such as entrance guard system startup monitor system.
Powerful network functions
After entering the network age, the network function in ATM DVR plays a very important role. Have the network, through the network to browse images, video playback and backup data through the network, through the network control alarm, etc., almost every local function can be done via the Internet. In the monitoring center, network function has been further strengthened, for example some ATM DVR card number is transmitted at the same time, grab a static picture images, uploaded to the monitoring center through the network, greatly enriched the database in the center of the field information.
In addition, ATM DVR function is the most prominent network two-way voice intercom. Users in the use of complicated problems encountered in the process of ATM machine, convenient press intercom button, you can launch voice intercom, seek help from the monitoring center, improve the satisfaction of users. The monitoring center can also be found in some unusual cases, active on the scene. As a result, the networking of the ATM DVR, gives the basic function of an ATM DVR greatly extended and rich.
Demand is changing, as demand for ATM DVR will be constantly updated, DVR manufacturers will also continue to more advanced technology, such as biometrics, etc.) is applied to the products, constantly improve the function of ATM DVR.
